What is Reddit's opinion of Tupavco TP511 WiFi Panel Antenna 2.4GHz (20dBi) Outdoor Directional (2400-2483 MHz) Wireless Network Signal (Pole Mast Mount) Weatherproof High-Gain Long Distance Range (N-Female Connector)?

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The connectors there will be standard RP-SMA, lots of options for alternative antennas.

If you can do an outdoor pole mount, directional panel antennas like this are pretty good https://www.amazon.com/Tupavco-TP511-Antenna-Wireless-Directional/dp/B008FH5UTG , for that one you'd also need to get an appropriate length N to RP-SMA cable

Don't need to use two antennas, and at long range it doesn't make as much difference, but if you do use a pair, have them one facing vertically and one facing horizontally.

Doing a repeater/access point setup instead of going only into the PC is an option, or can use the PC as the access point for your other devices too.

Looks a lot like a wifi antenna to me. I doubt the DNC is spending tens of thousands of dollars just to quiet a few Bernie bros

I think you might get better gain from the pringles can antenna mod, but yeah you really should have directional in each direction.

A pair of these really aught to do the trick, just don't sit in front of the antenna, at 20dbi of gain.

https://www.amazon.com/Tupavco-TP511-Antenna-Wireless-Directional/dp/B008FH5UTG?ref_=ast_sto_dp

maybe this, if your wifi router has an antenna port https://www.amazon.com/Tupavco-TP511-Antenna-Wireless-Directional/dp/B008FH5UTG/